IGGCAS OpenIR  > 岩石圈演化国家重点实验室
Complex Lithospheric Deformation in Eastern and Northeastern Tibet From Shear Wave Splitting Observations and Its Geodynamic Implications
Gao, Yifan1,2; Chen, Ling1,2,3; Wang, Xu1,2; Ai, Yinshuang2,3,4
2019-10-16
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
ISSN2169-9313
Pages16
AbstractThe eastern and northeastern Tibetan Plateau is a key region to study the growth and expansion of the plateau and associated extrusion tectonics. We studied the seismic anisotropic structure in this region by shear wave splitting analysis of teleseismic records from a dense linear seismic array, to constrain the lithospheric deformation and processes. We detected small-scale variations in anisotropy, including changes of splitting parameters around major faults and different anisotropy patterns among individual tectonic blocks and units but with consistent interior features. Our results combined with previous observations suggest that, in addition to the dominant effects of lateral extrusion induced by the India-Eurasia collision, major faults and tectonic heterogeneity may have also exerted significant impacts on the deformation and thus anisotropic structure of the lithosphere. In particular, we constructed two-layer anisotropy models for both the Longmenshan subblock in the easternmost Songpan-Ganzi terrane and the western Qinling orogen, indicating crust-mantle decoupling in these areas. The lower anisotropic layer of both areas shows a general NW-SE fast polarization direction. We attribute this feature to the large-scale mantle deformation, due to the lateral extrusion of Tibet associated with the India-Eurasia collision. The upper-layer anisotropy in both areas features an optimal NEE-SWW fast polarization direction. While in the Longmenshan subblock it may stem from crustal deformation under the combined effects of middle-lower crustal flow, faulting, and tectonic heterogeneity, that in the western Qinling orogen is probably resulted from shearing caused by upper crustal displacement along a midcrustal detachment.
KeywordShear-wave splitting Seismic anisotropy Eastern Tibet Northeastern Tibet Crust-mantle decoupling Middle-lower crustal flow detachment
DOI10.1029/2018JB017081
Funding OrganizationChinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS KeywordLOWER CRUSTAL FLOW ; MANTLE BENEATH TIBET ; SEISMIC ANISOTROPY ; KUNLUN FAULT ; CHINA ; PLATEAU ; ROCKS ; COLLISION ; TOMOGRAPHY ; SUBDUCTION
Language英语
Funding ProjectChinese Academy of Sciences[GJHZ1776] ; Chinese Academy of Sciences[XDA20070302] ; National Natural Science Foundation of China[41688103] ; [2011ZX05008001] ; [SinoProbe-02-03] ; [SKL-Z201704-11712180]
Funding OrganizationChinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000490402100001
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/93917
Collection岩石圈演化国家重点实验室
地球与行星物理院重点实验室
Corresponding AuthorChen, Ling
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
3.Chinese Acad Sci, Cen Ter Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China
4.Chinese Acad Sci, Key Lab Earth & Planetary Phys, Inst Geol & Geophys, Beijing, Peoples R China
First Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Geology and Geophysics, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Gao, Yifan,Chen, Ling,Wang, Xu,et al. Complex Lithospheric Deformation in Eastern and Northeastern Tibet From Shear Wave Splitting Observations and Its Geodynamic Implications[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2019:16.
APA Gao, Yifan,Chen, Ling,Wang, Xu,&Ai, Yinshuang.(2019).Complex Lithospheric Deformation in Eastern and Northeastern Tibet From Shear Wave Splitting Observations and Its Geodynamic Implications.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,16.
MLA Gao, Yifan,et al."Complex Lithospheric Deformation in Eastern and Northeastern Tibet From Shear Wave Splitting Observations and Its Geodynamic Implications".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH (2019):16.
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